package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import lombok.extern.log4j.Log4j;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //对前端穿过来的明文密码进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());

        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     *
     * @param employeeDTO 前端映射实体
     */
    @Override
    public void saveEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        //这边还有一个用户名重复的异常，需要交给全局异常处理器处理

        //前端并没有给到密码和状态
        //需要把密码在用md5加密
        String password = DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes());
        employee.setPassword(password);

        //设置状态
        employee.setStatus(StatusConstant.ENABLE);

        //补充剩下的属性
        //创造和修改时间
        //  employee.setCreateTime(LocalDateTime.now());
        // employee.setUpdateTime(LocalDateTime.now());

//        Long empId = BaseContext.getCurrentId();
//        log.info("当前员工id：{}", empId);
        //设置创造和修改者的id
        //employee.setCreateUser(empId);
        //employee.setUpdateUser(empId);

        //存入员工信息
        employeeMapper.insert(employee);
    }

    /**
     * 员工分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult queryPage(EmployeePageQueryDTO employeePageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total = page.getTotal();
        List<Employee> records = page.getResult();

        return new PageResult(total, records);
    }

    /**
     * 修改员工状态
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        Employee employee = Employee.builder().id(id).status(status).build();
        //不用手动添加公共字段值了
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工
     *
     * @param id
     * @return
     */
    @Override
    public EmployeeDTO getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        EmployeeDTO employeeDTO = new EmployeeDTO();
        BeanUtils.copyProperties(employee, employeeDTO);
        return employeeDTO;
    }

    /**
     * 编辑员工信息
     *
     * @param employeeDTO
     */
    @Override
    public void updateEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);

        //还要设置员工的修改时间和修改人的信息
        // employee.setUpdateTime(LocalDateTime.now());
        //employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    /**
     * 修改密码
     *
     * @param passwordEditDTO
     */
    @Override
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        //先判断老密码是不是一致
        //密码要先md5加密之后再对比
        String oldPassword = passwordEditDTO.getOldPassword();
        String oldPasswordAfterMD5 = DigestUtils.md5DigestAsHex(oldPassword.getBytes());
        String password = employeeMapper.getPasswordById(BaseContext.getCurrentId());
        if (!password.equals(oldPasswordAfterMD5)){
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_EDIT_FAILED);
        }
        passwordEditDTO.setEmpId(BaseContext.getCurrentId());
        passwordEditDTO.setNewPassword(DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()));
        employeeMapper.editPassWord(passwordEditDTO);
    }
}
